Cannabis-related crashes are on the rise. So much of the effort to reduce driving while high has focused on young people, but University of Michigan researchers say older adults need to be included. The reason: an estimated twenty percent of people over fifty who use cannabis products reported driving within two hours of using the drug. That means they likely got on the road while THC in cannabis still impaired their reaction and attention abilities. Men over fifty were much more likely—seventy-two percent—to drive while high. This second Michigan study goes deeper into data derived from the National Poll on Healthy Aging and published in the journal Drug and Alcohol Dependence.